I'm also confused.I'm running the latest AsteriskNOW version with a Asterisk 11.20.Everything is looking brilliant.After switching only the Asterisk Version to 13.6 the RTP quality is starting to drop.

I'm working for a company which is developing RTP monitoring software and we are inspecting the inter arrival time of the RTP packets. We are running our own software to monitor our VoIP supplier and there I spotted difference between the Asterisk versions.

I'm happy to provide you more details via webex or so if you are interested as the version switch is just one command.

I prefer to keep all discussions public as Asterisk is an open source project with a community. What exactly are you doing when noticing the change? Just a call between two endpoints? If so we don't even time in that instance, we just forward traffic.

I'm performing a automated call from the Asterisk via my VoIP provider to a different account on my Asterisk and I can see that the RTP packets of the RTP streams from the Asterisk are effected by more jitter in version 13.6 then in 11.20.That means I'm analyzing 4 RTP (2 calls) in this setup.

The difference is measured by inspecting the inter arrival time of the RTP streams.